feat(raft-library): task 1.1 — build scaffold (raft/ files + meson wiring)

src/lib/raft/raft.h

@@ -0,0 +1,10 @@
+#ifndef RAFT_H
+#define RAFT_H
+
+/* raft library — populated in task 2 */
+
+#include <errno.h>
+#include <stdint.h>
+#include <string.h>
+
+#endif /* RAFT_H */